Fixed condenser



1,642,688 Sept. 20, 1927- A, MOSS FIXED CONDENSER Filed July 14, 1925 M 7ZZINVENTOR.

Patented Sept. 20, 1927.

UNITED STATES ARTHUR X085, 02 NEW YORK. N. Y., ASSIGNOR TO ELECTRAD, 1110., OF NEW YORK,

PATENT OFFICE.-

N. Y., a conroaa'r'tonor NEW YORK.

rrxnn connmxsm.

Application filed July 14, 1925. Serial No. 43,611.

.This invention relates to fixed condensers, and while thepresent embodiment of the invention is specially designed and adapted to meet the,constantly increasing demand for 6 such condensers in radio receiving apparatus, it'will be understood that its use is -not limited and maybe extended to other electric circuits, without material change or modification.

The present day fixedcondenser consists of a stack, formed of alternate sheets of conducting and -nonconducting material, Such-as metal foil and mica; the conductin sheets being connected, at opposite ends'o the stack, in alternating relation, either by bein' provided with terminal extensions whic are clamped together, or having terminal rivets, solid or tubular, extending through the stack and mal-ringcontact at each Tend with every other sheet of the conducting material.

As a protection to the stack against rough or careless handling and to strengthen and stiffen it for connection between spring terminal clips, binding gosts or the like, the stack is reinforced by t e addition of heavy outer plates of bakelite or other insulating material and to secure such an assembly togetldier, metal clamps of various kinds are use The present invention has reference particularly to the form and arrangement of these metal clamps and the reinforcing oute plates of the stack.

The accompanying drawings Wlll serve to illustrate constructions suitable for carrying my invention into effect.

In the drawings:

Fig. 1 is a plan view showin the assembly of the stack and the outer rein orcing plates, before the condenser terminals are bent up;

Fig. 2 is a similar view of the completed condenser with one of the clamps broken,

away to show the bent up condenser plate terminals;

Fig. 3 IS a reverse plan view of the condenser shown in Fig. .2;

Fig. 4 is a cross-section on the line a, s, of Fig. 3;

Fig. 6 is a detail perspective view of a clamp member, and

Fig. 6 is a lan view of a modified form of condenser em dying my invention. Referring now to the drawings, the stack ing it ditiicu together to connect the sheets in two series,

as is customary in the art.

The usual method of securing the lugs or extensions 6, is to bend them, ouqmpon the other, around the adjacent end of the stack with their free ends projecting under one oi the stack clamps, by which they are held in close electrical contact.

It. is desirable and, racticall necessary to guard or shield t.ese condenser plate lugs or extensions from rough handling or accidental blows, etc.,'as the metal is very thin. This is usually accomplished by causing the stack clamp to entirely enclose the lugs but results in objectionably extending the clamp somewhat beyond the end of the stack proper to accommodate the bulge formed at the edge where the lu s are bent one over the other. As the capacity of these condensers is varied by using a greater or smaller number of plates, the extent to which the stack clamp Wlll be offset by being ent around the late lugs, will also vary, makll; to design an effective machine for applying the clam s.

To avoid this ditiicu ty, I employ reinforcing plates sufliciently oversize, as com ared to the condenser plates, to permit notches 7, to be formed at each end to accommodate the bend of the lu This enables the clamps to be snugly tted to the reinforcin plates and insures uniformit in the size 0 the clamps of condensers 0 this type for all capacity values.

In small fixed condensers, such as here shown, it is important to firmly and securely clamp the stack assembly, particularly, around the ed es, where damage is likely to short circuit t 0 plates.

In meeting this requirement, I rovide twin clamps, 8, 8, arranged in para el relation to encircle the stack assembly and protect both sides thereof and the edges. As shown, the clamps are secured by rivets 5, which pass through the clamps and the stack assembly, clear of contact with the condenser plates, which, as above pointed out, are notched to provide such clearance.

In addition to these two pressure points, the construction of the clamp employed is such as to provide four additional pressure points,-'mak1ng six in all.

Each-clamp consists of two members 10 and 11, one of \vhich is providedwith upturned ends 12, desi ned to be bent over to enga e the ends of t e cooperating member and orm a continuous band or strap, which completely encircles the stack. The four additional pressure points, referred to above, are formed where the lugs of one member of the clam s is bent over to engage the ends of the ot er member thereof.

To facilitate mouiitin thecondenser and also to providefiorrea'di eonnecting'a grid leak or other resistor unit in parallel therewith, lugs such as shown at 13, or 14, and

spring clips 15, are formed in part with one of the members of each clamp.

Having thus described my invent-ion, what I claim is:

A fixed condenser com rising a stack of alternately arranged con active and dielectric sheets, pressure plate members on oppdsite ends of said stack, one of said pressure plate membefs being provided with diametrically opposed odge recesses, lu'gs contiguous with eacho-I said conductive sheets, the lugs of the sheets of the one polarity being folded over said' last mentioned pressure plate member and within the recesses at he 'end of said plate member, while the ugs of the sheets of the opposite polarity are folded over said last mentioned pressure plate member in the recesses at the other end of said plate member, and U shaped clamp members disposed about said, lugs at opposite ends. of the stack for subjecting said stack to' pressure and establishing connection with the conductive sheets 'of said condenser.

ARTHUR Moss. 

